Control of electric circuits



Jan 23, 1923.

L. IVI. CLEMENT ET AL.

Ian.. 23, 1923. IJIBM?.

- `L. M. CLEMENT ET AL.

CONTROL 0F ELECTRIC CIRCUITSl l sitio'ned against the outer 365, 3S, of insulating uniterial, spaced apart by three tubes, 40, of insulating materiel, only two of which appear in the drawing. Threaded rods 42', t ,and 46 pass l'ongitruli nelly through the' horen o the tubes to hold the tubes clamped between the end discs S6, 38. The rods 42, and f6 also extend through tubular insulating elements t8 posiole of dise 36 and through the insi loting blocks 50 and the internally threadid metallic .blocks 52, the lolocks 52- eer-wing as nuts for elemping the elements 36, 38, e() and el@ together on the rods. rElie ends of elements 48 neu-rer the'blools 50 have reduc-ed externel diameter, and the rheostet is supported fr a switch @usiner 54 by having these rduced. portions or" the tubular element. t-8

-side of the dise 'und slidebly lnninted on the 'pass through apertures 56 in the end wall 58 of the switch casing, the end wall of the. Casing being clamped between hloelis 50 und, shoulder (i0 on the tuhuler elements 48.

Metallio bushings G2 and (53 in the end wall 5S and the diso 38 respectively, forni `bearings for the rheostet shaft l? which carrieslzhe rheostat Contact wiper or arm Q3. The buehing 62 is insulutetliroin the switch easing by insulation (Ell. The conta-et erin 23 is held in position on the shaft hy set screw 65 (see Fig: t), und this Contact arm et 'one 38 und a coller 66 'fastened on the shaft 17 at the other side of the (lise by set screw 67 prevent axial movement oi the shaft.

The resistance element or' the rheostut is @continuous wire 22, looped bueh and forth over the hooked ends oi" metallic pnnehings (5S und 69 which are fastened edgewise in the dise 3o and 38 respectively. Preferably e drop of solder is plzued :it euch point of Contact between the wire und the element 69.

Each of the punchings on and (39 is tiet and has'two protruding tail pier-es 'To and 7l on one odge. the piece T() extending through the insulattinew disc $56 or St, und heilig staked over as at 72. to hold the punrhingf in posi tion in the dise 36 or 38. The teil pier-e Tl holds the punching troni turning lutorully. The punchings -69 serve the stationery contacts of the rheostat.

The rheostat handle l2 is utter-hed rheostzit shaft l? hy Ineens ot u piu und slot connect-ion, they pin heine' fixed in the shaft und playing in u slot 76 iu sleeve .7?. The sleeve is rigidly connected to the handle end ofthe shutt. using is supported from :L

to tl ie The switch e metzillie plate Si) hy ineens ot' hols Hl pusslng through lugs H2 on the easing. .l dise Arheostut structure :it the i Mesem switch Contact 9 is e tj-shapedlstrip, und has one end mounted between hloehs 50 :nul

52 on rod The blocks 5() und 52 ure preferably clamped together hy nieuus ol" srrews 86, which prevent the contact strips t8 und le from turning about the rods 4G. 42, und 4l. ln the `free end of the U-shuped Contact strip 9 is an aperture through which the rheostzit shaft 17 psnsse:v loosely. A dise 87, of 'Dress or the like. is placed :it euch' side of the aperture, these dises haring,Y apertures through which shari/'t 1T passes loosely, and heingiF fustened to the strip hy' ltiny suitable Ineens, (not shown). (lne of the discs 87 is urged against the sleeve 7T by the pressure ot' one end ot' the spring ll, on the other (lise, the other end ot the springr ll hearing against the bushing G2. The shaft l? is electrically connected with the Contact. 9 through the bushing; (l2, the spring 1l and the dise 87 against which the spring ps S). 12E und i4 have hears. The Contact stri their free ends in u line painlleltothe rhoostzit shaft. Therefore` the spring ll causes the movable Contact E) 'to normally engage Contact i3, hut the handle '1Q muy he pressed to compress springr ll und thereby open the 0ir cuit through the lihznient und the rheostut et 9, i3 und close the eirouit ot' the ihunent andthe rheostut :it El, ll ut uny time, und regurdlees oi, und without interfering' with,

thel position of the rheoetat. urul 2l-. und

without interfering with any desired operation oi" the .rheostut urni.

The leads 20, 2l und 3l which romurt the combined switch und rheostnt rireuit` ne shown in l. ure uttzu'lud to the switch ioints indicated in Fig. el. The loud Q0 troni the filurnont l. is connected on terniinul piero flo, whieh iS ai punehing` set Odgrewise in the dise 3H utter the fashion in which the stutonury Contacts 69 olf the rheostut :are utter-hed to the dise 38., the leed '12() heiiigsohlered iu u hole 9L in the pieve llt). The pioee 90 is eonnected to one end of tlieiresistuneo wire :is shown in Fig-.1, l, the other end of the resistance wirel heineopen. or uueonneoted. The loud l 214-. eonneeted :it one end to the Vl'iuttery through leeds Q5 :1nd 52C, is Connerted et its.; other ond to u. terminal pluto 92, the pluto being` fastened on the dis l 3S hy ineens of the threaded rod l2 and being prevented roin turning uhout rod 42 hy ineens ol the passing' 'through the pluto Srl und stud Si?) into the dise 3R. The stud Sll :also serres to limit. the rotationof the rheostatarm 23. The plate 92 isin electrical engagement with the rod l2. The lead 31, connected at one end tothe lammetei' 15, is connected at its other end to a terminal piece 94, similar to the terminal piece 90. The terminal piece '94C is not connected to the resistance Wire 22, but is connected to the rod 44 by rod 95 and `terminal plate 9d,

Thus, the normal circuit through the combined rheostat and switch is from lead 2() and terminal piece 90, through resistance Wire 2Q, rlieostat arm 23, rheostat `shaft 17, luisliing 62, spring l1, disc 87 in contact tl'ierewit'h. movable switch contact 9, fixed switch contact 13, block '52 on rod 42, rod 42, and plate 92, to lead let; and the circuit through therheostat and su'itchwlien con tact .13 lis pressed into engagement with contact 14, is from lead 2() to the movable contact 9, as ust described, and thence through the fixed contact 1t, block on rod 44, rod 44, plate 196, lead 95, and terminal piece 9st, to lead 31. 4

Figa 2 illustrates an embodiment of the invention in which the filament currents are indicated by a milli-voltmetcr 1.15 adapted to measure the voltages-across shunts. 116, hone `ot which is permanently connected in the lead' 24 in series with the filament 1 and rheostat 7, and another ot' which is similarly connected with respect to the filament 2 and rheostat 8. The permanent electrical connection between theshuiit and the rlieostat shaft is made by connecting a lead (not showin) Vloetween the blocks 52 on rods 46 and L12 (Fig. 4E), ,for instance, and the contact 13 can he omitted. `Normally, the circuit from the millifvoltmeter is open. Pressure upon the handle 12 will cause the closing of the circuit of the inilli-voltmeter 115 to indicate the current through the filas nient.

the varying of said condition by.said con-= trol cmeans. l.

2. An electrical circuit,'measuring means for indicating an electrical condi-tion of said circuit, control means adapted to gradually Vary said condition of said circuit, one of Certain features'of the rheostatA disclosed; herein ist' the invention ot Arthur Haddock, f

said means being normally 4ineiiective to perform its stated function, and means tor simultaneously rendering` said one means effective to perform its stated function and operating the otherof the tivo tiistuiieii- 7u tioned means.

An electrical circuit7 measuring means for indicating an electrical condition of said circuit, control means adapted to gradually' vary said .condition oi' said circuit, one ot' 75 said means being' normally ineilective to perform its stated functiom'and bi-motional means for operating the other of the two first-mentioned means and renderingy said one means effective to perform its stated function.

4.. A circuit, la variable iii'ipedance adapted to vary the electrical condition ot' the cir cuit, normally ineffective measuring means adapted to indicate said condition and l'ii- 85 motional means for varyiiin' saidiinpedance hy one motion and capable of rendering the measuringr means eiective hy motion independent of the first-mentioned motion.

5. A circuit,avariahle impedance adapted 90 mally ineffective to indicate said electrical condition of said circuit, and means operable by the control means in any operative position ot said control means without the control 'means performing;r any control operation on said circuit, to render the indieating means eiective to indicate said cleo trical condition ot said circuit` y 7. A.plurality of circuits, individual im "'pedance Varying means for controlling said circuits, a common measuring means tor measuring the currents in the circuits but normally' ineffective to measure said. cui'- rents, and individual switches tor said circuits adapted to he operated to rendeifthe measuring means eltective to measure said currents, said impedance varying means and said switches being so mechanically re latedthat the selection oany one of said impedance' varying means for operation results in the selection of the proper lone of said switches to be operated to render the measuring' means etl'ective to measure the particular currentA varied by'said one impedance varying means.

8; A plurality of circuits, common ini dicating meansf'or indicating; an electrical condition of said circuits but normally in- .etlective to indicate said electrical condition ot said circuits, individual means for the circuits for rendering said indicating means eii'ective to indicate said electrical condition of said circuits, and individual control means for said circuits for varying said electrical condition of said circuits,

said individual iiieans and said control means being so related that selection ot any one ot' said control means tor operation ie-4 sults in the selection ofthe proper one ot said individual means to he operated to render the indicating means effective to indicate said electrical condition in the liarticular circuit controlled hy said one control means.

9. A plurality of circuits, indicating means for indicating an electrical condi tion or' said circuits but normally ineffective to indicate said electrical condition ot said circuits, individual means for the circuits for rendering said indicating means 'effective to indicate said electrical condition of said circuits, and individual control means for said circuits torvarying said electrical condition of said circuits, saidv individual means and said controlynieans ljeing so mechanically related that selection ot any one of said control means tor opera 'tion results in the selection ot the proper being adapted to operate the switch means.

11. A plurality of impedances,individual impedance varying means for the impedances, a common' measuring instrument nor mally 1neil'ectivey adapted to indicate any effective. to indicate said electrical coiidition in said impedances, each of the iinpedance varying means being adapted to operate the switch means.

l2. A pliiralityof impedances, individual impedance varying means movable to a 'plurality ot operative positions for varying the iinpedances, a common measuring instrument for measuring the 'current in the inipedances liut normally ineffective to measure said currents, and individual switches `for the impedances tor rendering said instrument effective to measure said currents, said impedance varying means lieing so nieclianically related to said switches that said switches may he operated liy said impedance varyingl means in any ot said ing means Without said in'ipedance varying means Ivarying said iinpedaiices. to render said measuring instrument effective. to measure the particular current to he varied.

13. An electrical system comprising a plurality oi translating devices. a vcommon measuring instrument adapted to measure the currents in said devices and individual switches for said circuits, each switch heilig adapted to assume a nunilier ot positions to vary the currentl in the corresponding translating device, and being adapted to have another motion, independent ot' whatever position it may he in ata iiarticular instant, for cutting in the measuring iiistrument to indicate the current in the corresponding translating device.

ln witness whereof, ive hereunto sulfiscribe our naines this v29th day ot November A. AD.. 1920.

LEiVlS M. GLEMENT. ARTHUR W'. llSllPAUGll. 

